Hole cutter
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United States of America Patent
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Dec 15, 2009
Grant Date -
Mar 29, 2007
app pub date -
Sep 27, 2006
filing date -
Sep 28, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
The front cutting edge is provided with an inner front cutting edge connected with an inner lateral cutting edge and an outer front cutting edge connected with an outer lateral cutting edge. A front flank corresponding to the front cutting edge is provided with an inner front flank corresponding to the inner front cutting edge and an outer front flank corresponding to the outer front cutting edge. An inner front clearance angle of the inner front flank is set at a larger value than an outer front clearance angle of the outer front flank. Therefore, it is difficult for the hole cutter to be chipped, and its cutting performance is also good.
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